Fix HAR extractor

Thanks to @mhils

examples/har_extractor.py

@@ -2,7 +2,7 @@
     This inline script utilizes harparser.HAR from
     https://github.com/JustusW/harparser to generate a HAR log object.
 """
-import mitmproxy
+import mitmproxy.ctx
 import six
 import sys
 import pytz
@@ -221,9 +221,11 @@ def done():
     if context.dump_file == '-':
         mitmproxy.ctx.log(pprint.pformat(json.loads(json_dump)))
     elif context.dump_file.endswith('.zhar'):
-        file(context.dump_file, "w").write(compressed_json_dump)
+        with open(context.dump_file, "wb") as f:
+            f.write(compressed_json_dump)
     else:
-        file(context.dump_file, "w").write(json_dump)
+        with open(context.dump_file, "wb") as f:
+            f.write(json_dump)
     mitmproxy.ctx.log(
         "HAR log finished with %s bytes (%s bytes compressed)" % (
             len(json_dump), len(compressed_json_dump)

test/mitmproxy/test_examples.py

@@ -1,5 +1,6 @@
 import json
 
+import six
 import sys
 import os.path
 from mitmproxy.flow import master
@@ -112,7 +113,7 @@ class TestScripts(mastertest.MasterTest):
             )
 
             path = os.path.join(tdir, "file")
-            m, sc = tscript("har_extractor.py", path)
+            m, sc = tscript("har_extractor.py", six.moves.shlex_quote(path))
             f = tutils.tflow(
                 req=netutils.treq(**times),
                 resp=netutils.tresp(**times)
@@ -120,6 +121,6 @@ class TestScripts(mastertest.MasterTest):
             self.invoke(m, "response", f)
             m.addons.remove(sc)
 
-            fp = open(path, "rb")
-            test_data = json.load(fp)
+            with open(path, "rb") as f:
+                test_data = json.load(f)
             assert len(test_data["log"]["pages"]) == 1